Control circuit of three-phase wound rotor asynchronous motor

A time relay is used to control the opening and closing of the noon resistor.
The action process of this circuit is:
    (1) Close Qs and connect SB1. The results are as follows:
    The KM1 coil is energized, the contacts (1-3) are closed and self-locking;
    When the KM1 coil is energized, the KM1 contact is closed and the motor M starts to start
(Shu and Ma Shen people);
    KMl (1-5) The contacts are closed and the KT1 coil is energized - KTl (1-7)
The contacts are delayed and closed .
    (2) KM2 coil is energized - KT2 main contact is closed and is short-circuited (cut
off) for a day.
    KM2 (1-9) Contact is closed - KT2 coil is energized - KT2 (1-11)
contact is delayed closed.
    (3) The KM3 coil is energized, the KM3 main contact is closed, the KM3 main contact is short-circuited
(cut off), and the starting process ends.